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15#include <crypto/internal/geniv.h>
16#include <crypto/internal/rng.h>
17#include <crypto/null.h>
18#include <crypto/scatterwalk.h>
19#include <linux/err.h>
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/rtnetlink.h>
24#include <linux/slab.h>
25#include <linux/seq_file.h>
26#include <linux/cryptouser.h>
27#include <net/netlink.h>
28
29#include "internal.h"
30
31static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
32 unsigned int keylen)
33{
34 unsigned long alignmask = crypto_aead_alignmask(tfm);
35 int ret;
36 u8 *buffer, *alignbuffer;
37 unsigned long absize;
38
39 absize = keylen + alignmask;
40 buffer = kmalloc(absize, GFP_ATOMIC);
41 if (!buffer)
42 return -ENOMEM;
43
44 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
45 memcpy(alignbuffer, key, keylen);
46 ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
47 memset(alignbuffer, 0, keylen);
48 kfree(buffer);
49 return ret;
50}
51
52int crypto_aead_setkey(struct crypto_aead *tfm,
53 const u8 *key, unsigned int keylen)
54{
55 unsigned long alignmask = crypto_aead_alignmask(tfm);
56
57 if ((unsigned long)key & alignmask)
58 return setkey_unaligned(tfm, key, keylen);
59
60 return crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
61}
62EXPORT_SYMBOL_GPL(crypto_aead_setkey);
63
64int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
65{
66 int err;
67
68 if (authsize > crypto_aead_maxauthsize(tfm))
69 return -EINVAL;
70
71 if (crypto_aead_alg(tfm)->setauthsize) {
72 err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
73 if (err)
74 return err;
75 }
76
77 tfm->authsize = authsize;
78 return 0;
79}
80EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
81
82static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
83{
84 struct crypto_aead *aead = __crypto_aead_cast(tfm);
85 struct aead_alg *alg = crypto_aead_alg(aead);
86
87 alg->exit(aead);
88}
89
90static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
91{
92 struct crypto_aead *aead = __crypto_aead_cast(tfm);
93 struct aead_alg *alg = crypto_aead_alg(aead);
94
95 aead->authsize = alg->maxauthsize;
96
97 if (alg->exit)
98 aead->base.exit = crypto_aead_exit_tfm;
99
100 if (alg->init)
101 return alg->init(aead);
102
103 return 0;
104}
105
106#ifdef CONFIG_NET
107static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
108{
109 struct crypto_report_aead raead;
110 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
111
112 strncpy(raead.type, "aead", sizeof(raead.type));
113 strncpy(raead.geniv, "<none>", sizeof(raead.geniv));
114
115 raead.blocksize = alg->cra_blocksize;
116 raead.maxauthsize = aead->maxauthsize;
117 raead.ivsize = aead->ivsize;
118
119 if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
120 sizeof(struct crypto_report_aead), &raead))
121 goto nla_put_failure;
122 return 0;
123
124nla_put_failure:
125 return -EMSGSIZE;
126}
127#else
128static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
129{
130 return -ENOSYS;
131}
132#endif
133
134static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
135 __attribute__ ((unused));
136static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
137{
138 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
139
140 seq_printf(m, "type : aead\n");
141 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
142 "yes" : "no");
143 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
144 seq_printf(m, "ivsize : %u\n", aead->ivsize);
145 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
146 seq_printf(m, "geniv : <none>\n");
147}
148
149static void crypto_aead_free_instance(struct crypto_instance *inst)
150{
151 struct aead_instance *aead = aead_instance(inst);
152
153 if (!aead->free) {
154 inst->tmpl->free(inst);
155 return;
156 }
157
158 aead->free(aead);
159}
160
161static const struct crypto_type crypto_aead_type = {
162 .extsize = crypto_alg_extsize,
163 .init_tfm = crypto_aead_init_tfm,
164 .free = crypto_aead_free_instance,
165#ifdef CONFIG_PROC_FS
166 .show = crypto_aead_show,
167#endif
168 .report = crypto_aead_report,
169 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
170 .maskset = CRYPTO_ALG_TYPE_MASK,
171 .type = CRYPTO_ALG_TYPE_AEAD,
172 .tfmsize = offsetof(struct crypto_aead, base),
173};
174
175static int aead_geniv_setkey(struct crypto_aead *tfm,
176 const u8 *key, unsigned int keylen)
177{
178 struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
179
180 return crypto_aead_setkey(ctx->child, key, keylen);
181}
182
183static int aead_geniv_setauthsize(struct crypto_aead *tfm,
184 unsigned int authsize)
185{
186 struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
187
188 return crypto_aead_setauthsize(ctx->child, authsize);
189}
190
191struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
192 struct rtattr **tb, u32 type, u32 mask)
193{
194 const char *name;
195 struct crypto_aead_spawn *spawn;
196 struct crypto_attr_type *algt;
197 struct aead_instance *inst;
198 struct aead_alg *alg;
199 unsigned int ivsize;
200 unsigned int maxauthsize;
201 int err;
202
203 algt = crypto_get_attr_type(tb);
204 if (IS_ERR(algt))
205 return ERR_CAST(algt);
206
207 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
208 return ERR_PTR(-EINVAL);
209
210 name = crypto_attr_alg_name(tb[1]);
211 if (IS_ERR(name))
212 return ERR_CAST(name);
213
214 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
215 if (!inst)
216 return ERR_PTR(-ENOMEM);
217
218 spawn = aead_instance_ctx(inst);
219
220
221 mask |= crypto_requires_sync(algt->type, algt->mask);
222
223 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
224 err = crypto_grab_aead(spawn, name, type, mask);
225 if (err)
226 goto err_free_inst;
227
228 alg = crypto_spawn_aead_alg(spawn);
229
230 ivsize = crypto_aead_alg_ivsize(alg);
231 maxauthsize = crypto_aead_alg_maxauthsize(alg);
232
233 err = -EINVAL;
234 if (ivsize < sizeof(u64))
235 goto err_drop_alg;
236
237 err = -ENAMETOOLONG;
238 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
239 "%s(%s)", tmpl->name, alg->base.cra_name) >=
240 CRYPTO_MAX_ALG_NAME)
241 goto err_drop_alg;
242 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
243 "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
244 CRYPTO_MAX_ALG_NAME)
245 goto err_drop_alg;
246
247 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
248 inst->alg.base.cra_priority = alg->base.cra_priority;
249 inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
250 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
251 inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
252
253 inst->alg.setkey = aead_geniv_setkey;
254 inst->alg.setauthsize = aead_geniv_setauthsize;
255
256 inst->alg.ivsize = ivsize;
257 inst->alg.maxauthsize = maxauthsize;
258
259out:
260 return inst;
261
262err_drop_alg:
263 crypto_drop_aead(spawn);
264err_free_inst:
265 kfree(inst);
266 inst = ERR_PTR(err);
267 goto out;
268}
269EXPORT_SYMBOL_GPL(aead_geniv_alloc);
270
271void aead_geniv_free(struct aead_instance *inst)
272{
273 crypto_drop_aead(aead_instance_ctx(inst));
274 kfree(inst);
275}
276EXPORT_SYMBOL_GPL(aead_geniv_free);
277
278int aead_init_geniv(struct crypto_aead *aead)
279{
280 struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
281 struct aead_instance *inst = aead_alg_instance(aead);
282 struct crypto_aead *child;
283 int err;
284
285 spin_lock_init(&ctx->lock);
286
287 err = crypto_get_default_rng();
288 if (err)
289 goto out;
290
291 err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
292 crypto_aead_ivsize(aead));
293 crypto_put_default_rng();
294 if (err)
295 goto out;
296
297 ctx->null = crypto_get_default_null_skcipher();
298 err = PTR_ERR(ctx->null);
299 if (IS_ERR(ctx->null))
300 goto out;
301
302 child = crypto_spawn_aead(aead_instance_ctx(inst));
303 err = PTR_ERR(child);
304 if (IS_ERR(child))
305 goto drop_null;
306
307 ctx->child = child;
308 crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
309 sizeof(struct aead_request));
310
311 err = 0;
312
313out:
314 return err;
315
316drop_null:
317 crypto_put_default_null_skcipher();
318 goto out;
319}
320EXPORT_SYMBOL_GPL(aead_init_geniv);
321
322void aead_exit_geniv(struct crypto_aead *tfm)
323{
324 struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
325
326 crypto_free_aead(ctx->child);
327 crypto_put_default_null_skcipher();
328}
329EXPORT_SYMBOL_GPL(aead_exit_geniv);
330
331int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
332 u32 type, u32 mask)
333{
334 spawn->base.frontend = &crypto_aead_type;
335 return crypto_grab_spawn(&spawn->base, name, type, mask);
336}
337EXPORT_SYMBOL_GPL(crypto_grab_aead);
338
339struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
340{
341 return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
342}
343EXPORT_SYMBOL_GPL(crypto_alloc_aead);
344
345static int aead_prepare_alg(struct aead_alg *alg)
346{
347 struct crypto_alg *base = &alg->base;
348
349 if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
350 return -EINVAL;
351
352 base->cra_type = &crypto_aead_type;
353 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
354 base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
355
356 return 0;
357}
358
359int crypto_register_aead(struct aead_alg *alg)
360{
361 struct crypto_alg *base = &alg->base;
362 int err;
363
364 err = aead_prepare_alg(alg);
365 if (err)
366 return err;
367
368 return crypto_register_alg(base);
369}
370EXPORT_SYMBOL_GPL(crypto_register_aead);
371
372void crypto_unregister_aead(struct aead_alg *alg)
373{
374 crypto_unregister_alg(&alg->base);
375}
376EXPORT_SYMBOL_GPL(crypto_unregister_aead);
377
378int crypto_register_aeads(struct aead_alg *algs, int count)
379{
380 int i, ret;
381
382 for (i = 0; i < count; i++) {
383 ret = crypto_register_aead(&algs[i]);
384 if (ret)
385 goto err;
386 }
387
388 return 0;
389
390err:
391 for (--i; i >= 0; --i)
392 crypto_unregister_aead(&algs[i]);
393
394 return ret;
395}
396EXPORT_SYMBOL_GPL(crypto_register_aeads);
397
398void crypto_unregister_aeads(struct aead_alg *algs, int count)
399{
400 int i;
401
402 for (i = count - 1; i >= 0; --i)
403 crypto_unregister_aead(&algs[i]);
404}
405EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
406
407int aead_register_instance(struct crypto_template *tmpl,
408 struct aead_instance *inst)
409{
410 int err;
411
412 err = aead_prepare_alg(&inst->alg);
413 if (err)
414 return err;
415
416 return crypto_register_instance(tmpl, aead_crypto_instance(inst));
417}
418EXPORT_SYMBOL_GPL(aead_register_instance);
419
420MODULE_LICENSE("GPL");
421MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
422
